US2015063315A1PendingUtilityA1

Sub-channel selection to reduce latency of circuit-switched fallback

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Assignee: QUALCOMM INCPriority: Aug 30, 2013Filed: Aug 30, 2013Published: Mar 5, 2015
Est. expiryAug 30, 2033(~7.1 yrs left)· nominal 20-yr term from priority
Inventors:Ming YangTom ChinGuangming Shi
H04J 3/1694H04W 74/0833H04J 2013/165H04W 36/00224H04W 76/50H04W 74/085
42
PatentIndex Score
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Claims

Abstract

It is determined whether a specific call type occurs. A random access preamble is transmitted at an earliest available sub-channel when the specific call type occurs. The random access preamble is transmitted at an assigned sub-channel when the specific call type does not occur. The call type can be a circuit switched fall back (CSFB) call or an emergency call.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A method of wireless communication, comprising:
 determining whether a specific call type occurs;   transmitting a random access preamble at an earliest available sub-channel when the specific call type occurs; and   transmitting the random access preamble at an assigned sub-channel when the specific call type does not occur.   
     
     
         2 . The method of  claim 1 , in which the earliest available sub-channel is an uplink pilot channel (UpPCH) in a Time-Division Synchronous Code Division Multiple Access (TD-SCDMA) network. 
     
     
         3 . The method of  claim 1 , in which the random access preamble is a synchronous uplink sequence (SYNC-UL) in a Time-Division Synchronous Code Division Multiple Access (TD-SCDMA) network. 
     
     
         4 . The method of  claim 1 , in which the specific call type is a circuit switched fall back (CSFB) call. 
     
     
         5 . The method of  claim 1 , in which the specific call type is an emergency call. 
     
     
         6 . An apparatus for wireless communication, comprising:
 means for determining whether a specific call type occurs;   means for transmitting a random access preamble at an earliest available sub-channel when the specific call type occurs; and   means for transmitting the random access preamble at an assigned sub-channel when the specific call type does not occur.   
     
     
         7 . The apparatus of  claim 6 , in which the earliest available sub-channel is an uplink pilot channel (UpPCH) in a Time-Division Synchronous Code Division Multiple Access (TD-SCDMA) network. 
     
     
         8 . The apparatus of  claim 6 , in which the random access preamble is a synchronous uplink sequence (SYNC-UL) in a Time-Division Synchronous Code Division Multiple Access (TD-SCDMA) network. 
     
     
         9 . The apparatus of  claim 6 , in which the specific call type is a circuit switched fall back (CSFB) call. 
     
     
         10 . The apparatus of  claim 6 , in which the specific call type is an emergency call. 
     
     
         11 . A computer program product for wireless communication in a wireless network, comprising:
 a non-transitory computer-readable medium having non-transitory program code recorded thereon, the program code comprising:   program code to determine whether a specific call type occurs;   program code to transmit a random access preamble at an earliest available sub-channel when the specific call type occurs; and   program code to transmit the random access preamble at an assigned sub-channel when the specific call type does not occur.   
     
     
         12 . The computer program product of  claim 11 , in which the earliest available sub-channel is an uplink pilot channel (UpPCH) in a Time-Division Synchronous Code Division Multiple Access (TD-SCDMA) network. 
     
     
         13 . The computer program product of  claim 11 , in which the random access preamble is a synchronous uplink sequence (SYNC-UL) in a Time-Division Synchronous Code Division Multiple Access (TD-SCDMA) network. 
     
     
         14 . The computer program product of  claim 11 , in which the specific call type is a circuit switched fall back (CSFB) call. 
     
     
         15 . The computer program product of  claim 11 , in which the specific call type is an emergency call. 
     
     
         16 . An apparatus for wireless communication, comprising:
 a memory; and   at least one processor coupled to the memory, the at least one processor being configured:   to determine whether a specific call type occurs;   to transmit a random access preamble at an earliest available sub-channel when the specific call type occurs; and   to transmit the random access preamble at an assigned sub-channel when the specific call type does not occur.   
     
     
         17 . The apparatus of  claim 16 , in which the earliest available sub-channel is an uplink pilot channel (UpPCH) in a Time-Division Synchronous Code Division Multiple Access (TD-SCDMA) network. 
     
     
         18 . The apparatus of  claim 16 , in which the random access preamble is a synchronous uplink sequence (SYNC-UL) in a Time-Division Synchronous Code Division Multiple Access (TD-SCDMA) network. 
     
     
         19 . The apparatus of  claim 16 , in which the specific call type is a circuit switched fall back (CSFB) call. 
     
     
         20 . The apparatus of  claim 16 , in which the specific call type is an emergency call.

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